Securing field-magnet poles



H. G. REIST.

SECURING FIELD MAGNET POLBS.

Patented Dec. 15, 1896.

UNITED STATES PATENT OFFICE.

HENRY G. REIST, OF SCHENECTADY, NEIV YORK, ASSIGNOR TO TIIE GENERAL ELECTRIC COMPANY, OF NEW YORK.

SECURING FIELD-MAGNET POLES.

SPECIFICATION forming part of Letters Patent No. 573,107, dated December 15, 1896.

Application filed August 24, 1896. Serial No. 603,698. (No model.)

To all whom it may concern:

Be it known that I, HENRY Gr. REIs'l, a citizen of the United States, residing at Sehen ectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Securing Field-Hagnet Poles, (Case No. 426,) of which the fol lowing is a specification.

My invention relates to securing pole-pieces to revolving field-magnet structures, particularly in alternating-current dynamos, where the field-magnet poles are made of assembled laminations of sheet-iron. To this end I make the laminations with a dovetailed tenon upon the ends, so that when they are assembled the pole-pieee may be slipped sidewise into the field-magnet structure. I then insert keys, so as to take up any lost motion between the pole-piece and the field-magnet, the end plates of the poles being provided with overhanging lips or flanges which serve to retain the field-magnet coils in place. I may then remove any field-magnet coil or any pole-piece without removing the fieldmagnet structure as a whole.

It ismanifest that the invention may take a number of forms, all embodying the same general characteristics. Some of these forms I have illustrated in the accompanying drawings, in which-= Figure 1 is a side elevation of one form of my invention, Fig. 2 a section on the line 2 2 of Fig. 1, and Figs. 3,- i, and 5 side elevations of modifications, all, however, embracing the same general idea.

In Fig. 1, A is the field-magnet spider. Bis its outer rim,which may or may not be laminated.

O G are the fieldanagnet poles, composed of v a body of laminations G and end plates C having overhanging flanges O for securing the field-magnet coils D in place. Bolts E E compress the parts, so as to make each pole-piece a solid structure. The bottom of each pole-piece is formed with a dovetailed tenon C", and keys G G serve to take up any lost motion or play between the parts.

In Fig. 3 I show substantially the same device, except that the dovetailed tenon is re placed by another of different form.

In Fig. 4c the keys G are inserted below the pole instead of between the shoulder upon the pole and the revolving spider or fieldmagnet structure, while in Fig. 5 the key K is supplemented by a bolt or set-screw II, locking the pole in place.

It is manifest that any of these forms come within my invention, which embodies such a mode of attachment as would permit the-sidewise removal of any oneof the pole-pieces without affecting the rest of the magnetic structure.

hat I claim as new, and desire to secure by Letters Patent of the United States, is

l. The combination with a revolving fieldmagnet structure, of pole-pieces separated from each other, and arranged on the periphery of said field-magnet structure, said pole-pieces being composed of laminated material, and being dovetailed into the periphcry of said revolving structure, and means for taking up the play of the parts.

2. The combination with a revolving iieldmagnet structure, of pole-pieces projecting from the periphery of said field-magnet structure and separated from each other, said pole-pieces being each composed of a bundle of lamina}, and outside clamping-plates, the several parts being bolted together, the polepieces being dovetailed to the periphery of said revolving structure, and keys for taking up the play of the parts, as herein set forth.

In witness whereof I have hereunto set my hand this 22d day of August, 1896.

HENRY G. REIST. Witnesses:

E. XV. CADY, A. F. MACDONALD. 

